Update app.py

app.py

@@ -5,7 +5,7 @@ import requests
 def chat(input):
     url = 'http://dark.21cnai.com:5000/api/chat'
     data = { "message": input }
-    headers = {"Content-Type": "text/plain","Authorization":"Bearer kdfjwoieskdflasdnf"}
+    headers = {"Content-Type": "Application/json","Authorization":"Bearer kdfjwoieskdflasdnf"}
     response = requests.post(url, json=data, headers=headers)
     print(response.text)
     return response.text